An update anomaly can occur if A. an instance of the same data is stored in two or more places in the database. B. a data element is deleted and causes the loss of information about a different data element. C. a user incorrectly changes a value. D. a data element is left out of an update.

A. an instance of the same data is stored in two or more places in the database.

Explanation:

Giving that Update Anomalies usually occur when the designated user person in keeping records or record master stored a particular data in more than one in a database. This is what is called duplication of data and is termed an irregularity on the part of the record keeper.

Hence, the correct answer to the question is " A. an instance of the same data is stored in two or more places in the database."